[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/meta/meta-mediatek/classes/boot-ubifs.bbclass b/meta/meta-mediatek/classes/boot-ubifs.bbclass
new file mode 100644
index 0000000..7508234
--- /dev/null
+++ b/meta/meta-mediatek/classes/boot-ubifs.bbclass
@@ -0,0 +1,4 @@
+add_boot_image() {

+    install -d ${IMAGE_ROOTFS}/boot/

+    install ${DEPLOY_DIR_IMAGE}/boot.img ${IMAGE_ROOTFS}/boot/

+}